.demo {
  width: 200px;
  height: 200px;
  background-color: salmon;
  display: flex;
}
.demo1 {
  width: 200px;
  height: 200px;
  background-image: url("../images/react.png");
}
.demo2 {
  width: 200px;
  height: 200px;
  background-image: url("../images/vue.png");
  background-size: cover;
}
